Lighter period than usual?

Anna
Hi guys, this may seem like a dumb question but here we go. I'm currently on the pill (I have been for 8 years, taking a short break from it last year for the first time, and I have now been back on it for 2 months). So I'm not worried I'm pregnant. I'm currently on my period and it is an awful lot lighter than usual. I normally struggle with cramps and have very heavy bleeding, this time though I have still had the cramps but next to no blood whatsoever all week. Does anyone have any idea what this could be? Or has anyone experienced something similar? I have been on google and all the suggestions are saying menopause (I'm only 22- yes I know it can happen at any age) or some kind of cervical problem trapping the blood. Any ideas??